To Furnace's surprise there was a hidden element to the ritual.
The recloacked man corrected him but he didn't know why. The man behind the table seemed to have no problem with the way he was chanting.
He suggested an incantation returning a riddle.
Perhaps this was an advanced form of magic. A ritual using less materials didn't seem like logical step up.
Then again, some materials needed to smelt longer at lower temperatures. Maybe this was similar.
In the same way, only slightly more confused, Furnace shouted his incantation at the shopkeep.
"How low are you willing to go?"